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Related Concept Videos

Modified-Release Drug Delivery Systems: Rate-Programmed I01:22

Modified-Release Drug Delivery Systems: Rate-Programmed I

Rate-programmed drug delivery systems (DDS) are designed to release drugs at specific, controlled rates to maintain consistent therapeutic levels. These systems are categorized based on their release mechanisms, including dissolution-controlled DDS, diffusion-controlled DDS, and combined dissolution-diffusion-controlled DDS.In dissolution-controlled DDS, the release rate depends on the slow dissolution of the drug itself or the surrounding matrix. Drugs with inherently slow dissolution rates,...
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Rate-programmed drug delivery systems release drugs in a controlled manner to maintain therapeutic levels. Three main designs include reservoir, matrix, and hybrid systems.Reservoir systems consist of a drug core enclosed within a membrane that controls drug release. In non-swelling reservoir systems, polymers like ethyl cellulose or polymethacrylates are used. These do not hydrate in aqueous media and control release through membrane thickness, porosity, or insolubility. This type includes...
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Rapid, Scalable Assembly and Loading of Bioactive Proteins and Immunostimulants into Diverse Synthetic Nanocarriers Via Flash Nanoprecipitation
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Interactive mixture as a rapid drug delivery system.

Chin Chiat Lee1, Charlene Li Ching Ong, Paul Wan Sia Heng

  • 1ISP Asia Pacific Pte Ltd, Singapore Science Park, Republic of Singapore.

Drug Development and Industrial Pharmacy
|February 28, 2008
PubMed
Summary

Interactive mixtures effectively deliver fine hydrophobic drugs at high loads, outperforming solid dispersions which can cause drug coarsening. This research compares drug delivery systems for optimal formulation.

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Area of Science:

  • Pharmaceutical Sciences
  • Materials Science

Background:

  • Drug delivery systems aim to enhance therapeutic efficacy.
  • Hydrophobic drugs often present formulation challenges due to poor solubility.
  • Polyethylene glycol (PEG) 3350 is a common excipient in drug formulations.

Purpose of the Study:

  • To compare the effectiveness of interactive mixtures versus solid dispersions for rapid drug delivery.
  • To investigate the impact of drug load, particle size, and crystallinity on these systems.
  • To determine the optimal formulation strategy for delivering fine hydrophobic drugs.

Main Methods:

  • Preparation of interactive mixtures via physical mixing and solid dispersions via melting.
  • Analysis of drug particle size and crystallinity in prepared systems.
  • Conducting dissolution tests to evaluate drug release rates and extents.

Main Results:

  • Solid dispersions showed higher effectiveness at low drug loads due to PEG 3350 reducing drug particle size.
  • Decreased effective drug particle size generally enhanced dissolution rate and extent.
  • Interactive mixtures maintained high drug dissolution efficacy even with high loads of fine drug particles, unlike solid dispersions which suffered from drug coarsening.

Conclusions:

  • Interactive mixtures are suitable for high-load formulations of fine hydrophobic drugs.
  • Solid dispersions are effective for low drug loads but prone to drug coarsening at high loads.
  • The choice between interactive mixtures and solid dispersions depends on drug load and desired particle size control.